问题
单项选择题
Silk（）one of the primary goods traded along the Silk Road by about 100 BC.
A. had become
B. reject
C. control
D. abandon
答案
参考答案：A
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Silk（）one of the primary goods traded along the Silk Road by about 100 BC.
A. had become
B. reject
C. control
D. abandon
参考答案：A